Straight-line-discharge protector



Aug; 12, 1930. H. N. SESLAR I STRAIGHT LINE DISCHARGE PROTECTOR Filed Oct. 2, 1929 lMST/PUME/VT glwwnto'c Patented Aug. 12, 1930 UNITED STATES" PATENT OFFICE- HENRY N. SESLAR, OF MILWAUKEE, WISCONSIN, ASSIGNOR OF ONE-HALF TO ED- -MOND A. MACBETH, OF NEW YORK, N. Y.

STRAIGHT-LINE-DISCHARGE PROTECTOR Application filed October 2, 1929.

This invention is a novel straight line discharge protector for instrument circuits, such as telephone or radio circuits or the like, and the principal object of the invention is to provide a protector adapted to be connected between the power leads and the instrument, the protector embodying the feature of pro viding a straight line electrical discharge to ground of all currents of abnormally high potential. Further objects are to provide a protector offering resistance to the flow of high potential currents to the instrument protected by means of sharp angle return bends in the power leads, the return bends leading to the instrument; and to provide a protector having fuses in the power lines adapted to be ruptured by the opposed magnetic fields of the conductors and their return bends. Other minor objects will be hereinafter set forth.

I will explain the invention with reference to the accompanying drawing which illustrates one practical embodiment thereof to enable others familiar with the art to adopt and use the same; and will summarize in the claims the novel features of construction, and novel combinations of parts, for which protection is desired.

In said drawings tector circuit.

Fig. 2 is an enlarged plan view of the protector.

Fig. 3 is a side elevation thereof.

Fig. 4 is a section on the line 4-4 Fig. 2.

As shown in Fig. 1 the protector circuit is designed for straight line discharge to the ground, the line conductors 1 and 2 havingtheir terminals 1 and 2 connected directly to the usual power lines or leads (not shown) the opposite ends of conductors 1 and 2 being connected to discharge blocks 3 and 4 directly connected to ground G. In the conductors 1 and 2 intermediate the terminals 1, 2,

and discharge blocks 3, 4, are interposed fuses 5 and 6 of desired capacity.

The instrument conductors 7 and 8 are disposed parallel with and between the line conductors 1 and 2, and extend from instrument terminals '7, 8 adjacent their respective line Fig. 1 is a diagrammatlc view of the pro- Serial No. 396,914.

conductors 1 and 2 beyond the fuses 5 and 6, the ends of conductors 7 and 8 opposite from the terminals 7 and 8 being connected as at 7 8 with the discharge blocks 3 and 4:, the portions 7, 8 making sharp or acute angles with the line conductors 1 and 2, so that the current passing from terminals 1, 2 through line conductors 1 and 2 must make a sharp angle return bend through portions 7", 8 in passing to the instrument terminals 7 and 8.

A sharp angle offers resistance to the flow of electric current, therefore such an an le is made at each return bend in the circuit leading to the instrument, to retard the flow of high potential electric currents to the instrument protected.

A current with a high potential entering the conductors 1 and 2 from the power leads has a natural tendency to proceed in a straight line; therefore the discharge blocks 3 and 4, are placed in alignment with the conductors 1 and 2 or the entrance of the, current to the protector so that the current may follow its natural course and be prevented from entering the instrument protected.

Another feature of the circuit shown in Fig. 1 is that in case an electric current, with potential high enough to be dangerous to the instrument protected, enter the protector conductors 1 and 2, and in case any portion of this high potential current dangerous to the instrument protected. should pass the return bends 7", 8 and pass toward the instrument, magnetic fields will be set up around the conductors 7 and 8 carrying such current, which magnetic fields will oppose the force of the magnetic fields set up around the conductors 1 and 2 thereby placing great stress upon the fuses 5 and 6, rupturing said fuses and opening the circuit to the instrument much more quickly than would be experienced should the sharp angle return bends to the ins rument be omitted from the circuit.

The magnetic stresses which rupture the fuse are of electrical nature, but the rupture of the fuse is of a physical nature, the same being a physical break in the fuse.

The specific embodiment of the protector shown in Figs. 2, 3 and 4, preferably com- 1 0 p s e 10 of porcelain or other suitable n GHQ material, with two parallel raised 1 and 12 thereon ano preferably inte- {i uerewith, the ribs 11 and 12 supporting t n luctors and fuses ss lereinatter set vwn the ribs 11 and 12 are subin section and 12 in their upper rners, en l their lower ends are ll towards the outer lowto orm the acute or sharp angle return ends. The conductors l and 2 are preteablt nrade of bronze or other metal and a e diswidth, and are 15 P faces of ribs 11 and i? re the uoue ends oi the line cured to the ribs the conductors s disposed in T- 20 l t rett' V 5 11 12 in the faces or the porcelain ribs. The upper ends of conductors l and Q :1 V d or bent on wardl away from t e ribs and carry copper or bronze bolts 1- and forming the termi- It he power veen each co his is flat bronze good onductors having; Oilthe use holders s oi conductors l and 2 z e in the form of clips a p i the lower ends or fuse h:- L i I which holders are inserted between the conductors and bronze or other r i i ctrical contact with the ind the lower ends of .nz ed outwardly as at 16* instrument conducon the inner side s ow the r is, and the lower conductors and strips 16 are se- 4 ier by means of bolts 1'? tr; nslixof the holder to form a circuit from terminals and 1e discharge and are preterably or the standard ooth carbon type, are

held against the flan. es 16 of strips 16 by clips 19 of bronze bolted or screwed to the base 10, the two CllQS 19 bEl connected to a common bronze or cop ier ground bus bar 2 having a terminal 2!) connecteo with a ground coi ductor 21.

The materials, both m tal id non-metal, may be rarie'l desire. an e, I do not con sider my invention limited to the specific odimeut sho an in the drawing, for obly changes may be made therein within ltlie claims.

11 u pr tector for electrical receptive cs, conductors llflVlIlf" eturn )end por trons udz'ipted to be connected acres the re centire dence; and means at the bends :lior p oviding strai line dischar 'e tor cur rents oi abnormelh 2. In a protector set the return bends melting acute angles wit tl conduct to maximum resie against ilow of curren oi :i iinormally hi potential to the receptive device.

In combination with a protector as set .rth in claim 1; a lire in each r iductor dis posed in the magnetic of the conductor lo. a protector rieal receptive lee COiLtlllCLOlo no. p rallel NPilliA portions adapted to be connected across recept' re 1 i to device: the 1' 1 i acpceiit and groundee d4 of the bends for tential.

In a protector as forth in claim return beu inalnn acute auo'les wi l conducto otter ma. eneinst iiow current 0t bnoi potential to the receptive device.

7. In combination with a protector as set forth in claim 5; fuse in each conductor disin the oppoted magne tic fields of the luctoi and MS return b 1d.

e. protector to in clan": 3.. he

ends inalrir t e: with the conductors; anu fuses in the crnductors adacent the return bent 9. A protec or for eonipr' inFuiatin-g ma mounted on one return bend po l to an e M and ineana at the redischzzrue for curadjacent the return bends t the bends; and the return bends making acute angles with the conductors to offer maximum resistance against flow of current of abnormally high potential to the receptive device.

11. In a protector as set forth in claim 9; a fuse in each conductor mounted on the ribs and adapted to be physically ruptured by the opposed magnetic iields of the conductor and its return bend.

12. In a protector as set forth in claim 9; the return bends fitting the ends of the ribs and making acute angles with the conductors; and fuses in the conductors mounted on the ribs adjacent the return bends.

13. A protector for electrical receptive devices, comprising a base of insulating material having raised ribs thereon; a conductor mounted on one side of each rib and having a return bend portion secured to the other side of the rib adapted to be connected to electrical receptive device; and grounded discharge blocks at the return bends for providing straight line discharge for currents of abnormally high potential.

14. In a protector as set forth in claim 13; the ends of the ribs adjacent the return bends being shaped to lit the bends; and the return ends making acute angles with the conductors to offer maximum resistance against flow of current of abnormally high potential to the receptive device.

15. In a protector as set forth in claim 13; a fuse in each conductor mounted on the ribs and adapted to be physically ruptured by the opposed magnetic fields of the conductor and its return bend.

10. In a protector as set forth in claim 13; the return bends fitting the ends of the ribs and making acute angles with the conductors; and fuses in the conductors mounted on the ribs adjacent the return bends.

17. A protector for electrical receptive devices, comprising a base of insulating material having a pair of spaced parallel raised ribs thereon a pair of conductors mounted on the outer side faces of the ribs and having return bend portions secured to the inner side faces of the ribs and adapted to be connected across the terminals of an electrical receptive device; and rounded discharge blocks at the HPQXGS of the bends for providing straight line discharge for currents of abnormally high potential.

18. In a protector as set forth in claim 17; the ends of the ribs adjacent the return bends being shaped to fit the return bends; and the return bends making acute angles with the conductors to offer maximum resistance against flow of current of abnormally high potential to the receptive device.

19. In a protector as set forth in claim 17; a fuse in each conductor mounted on the ribs and adapted to be physically ruptured by the opposed magnetic iields of the conductor and its return bend.

20. In a protector as set forth in claim 17; the return bends fitting the ends of the ribs and making acute angles with the conductors; and fuses in the conductors mounted on the ribs adjacent the return bends.

HENRY N. SESLAR. 

